admin: gift granting, collectible attribute/number control, and Layer 228 moderation tools

Admin console additions (Layer 228):
- Give Gifts: dedicated tab with sorted Lottie/TGS gift picker + inline form; grant any catalog gift to a user/channel from 777000 (no charge)
- Upgraded/collectible delivery: mint a unique gift with admin-selected model/pattern/backdrop and custom number, or random/auto (DB FK + UNIQUE(gift_id,num) enforce invariants)
- SCAM/FAKE flags for users/channels (migration 0136) with configurable profile warning (TELESRV_SCAM_WARNING/TELESRV_FAKE_WARNING)
- Support toggle, force channel settings incl. gigagroup (migration 0137), username management, cosmetic color/emoji-status
- Emoji admin tab (custom emoji list + document IDs + Lottie/TGS preview)
- Bot management; soft UI / dark theme
Wired through Router -> admin.Service -> adminapi -> BFF -> React panel (en/zh/ru).

internal/domain/star_gift.go

@@ -327,6 +327,33 @@ type StarGiftUpgradeRequest struct {
 	Date                int
 	OriginAuthKeyID     [8]byte
 	OriginSessionID     int64
+
+	// Admin-controlled minting overrides. When non-zero these pin the specific
+	// collectible attributes / number instead of the random pool draw and the
+	// sequential issued+1 number. They are only honoured on the admin grant path;
+	// the DB FK (attribute must belong to the revision) and UNIQUE(gift_id,num)
+	// constraints remain the source of truth.
+	ModelAttributeID    int64
+	PatternAttributeID  int64
+	BackdropAttributeID int64
+	Num                 int
+}
+
+// AdminStarGiftGrant is one admin "give gift" command: deliver GiftID to
+// Recipient from Sender (0 => official system account 777000) at no charge.
+// When Upgrade is set the gift is minted as a collectible; the optional
+// attribute IDs / Num pin specific collectible facts (0 => random/auto).
+type AdminStarGiftGrant struct {
+	SenderID            int64
+	Recipient           Peer
+	GiftID              int64
+	HideName            bool
+	Message             string
+	Upgrade             bool
+	ModelAttributeID    int64
+	PatternAttributeID  int64
+	BackdropAttributeID int64
+	Num                 int
 }
 
 type StarGiftPurchaseRequest struct {
@@ -900,6 +927,7 @@ var (
 	ErrStarGiftAlreadyUpgraded        = errors.New("stargift: already upgraded")
 	ErrStarGiftCollectibleSoldOut     = errors.New("stargift: collectible supply exhausted")
 	ErrStarGiftCollectibleInvalid     = errors.New("stargift: invalid collectible definition")
+	ErrStarGiftCollectibleNumberTaken = errors.New("stargift: collectible number already taken")
 	ErrStarGiftCollectionNotFound     = errors.New("stargift: collection not found")
 	ErrStarGiftCollectionsFull        = errors.New("stargift: collections full")
 	ErrStarGiftUnavailable            = errors.New("stargift: unavailable")